1 files changed, 28 insertions, 1 deletions
diff --git a/tests/src/hashmap.rs b/tests/src/hashmap.rs
index 4552e4f2..ccb96e1e 100644
--- a/tests/src/hashmap.rs
+++ b/tests/src/hashmap.rs
@@ -1,9 +1,11 @@
+//@ charon-args=--opaque=hashmap_utils
+//@ aeneas-args=-state -split-files
 //@ [coq] aeneas-args=-use-fuel
-//@ aeneas-args=-split-files
 //@ [fstar] aeneas-args=-decreases-clauses -template-clauses
 //@ [lean] aeneas-args=-no-gen-lib-entry
 // ^ the `-no-gen-lib-entry` is because we add a custom import in the Hashmap.lean file: we do not
 // want to overwrite it.
+// Possible to add `--no-code-duplication` if we use the optimized MIR
 // TODO: reactivate -test-trans-units
 
 //! A hashmap implementation.
@@ -314,6 +316,31 @@ impl<T> HashMap<T> {
     }
 }
 
+// This is a module so we can tell charon to leave it opaque
+mod hashmap_utils {
+    use crate::*;
+
+    /// Serialize a hash map - we don't have traits, so we fix the type of the
+    /// values (this is not the interesting part anyway)
+    pub(crate) fn serialize(_hm: HashMap<u64>) {
+        unimplemented!();
+    }
+    /// Deserialize a hash map - we don't have traits, so we fix the type of the
+    /// values (this is not the interesting part anyway)
+    pub(crate) fn deserialize() -> HashMap<u64> {
+        unimplemented!();
+    }
+}
+
+pub fn insert_on_disk(key: Key, value: u64) {
+    // Deserialize
+    let mut hm = hashmap_utils::deserialize();
+    // Update
+    hm.insert(key, value);
+    // Serialize
+    hashmap_utils::serialize(hm);
+}
+
 /// I currently can't retrieve functions marked with the attribute #[test],
 /// while I want to extract the unit tests and use the normalize on them,
 /// so I have to define the test functions somewhere and call them from